APA (7th ed.) Citation

Denning, P. J., & Metcalfe, R. M. (1997). Beyond calculation: The next fifty years of computing. Copernicus.

Chicago Style (17th ed.) Citation

Denning, Peter J., and Robert M. Metcalfe. Beyond Calculation: The Next Fifty Years of Computing. New York: Copernicus, 1997.

MLA (9th ed.) Citation

Denning, Peter J., and Robert M. Metcalfe. Beyond Calculation: The Next Fifty Years of Computing. Copernicus, 1997.